使用Google Maps API旋转SVG符号以匹配飞机航向

I've been trying to rotate the Google Maps API SVG aircraft symbol so it shows the aircraft's correct heading each time the symbol moves. It initially loads showing the correct heading - I just can't seem to work out how to update it to the new heading. I've spent 2 days trying and very much failing. I thought I'd be able to simply change it by adding I've been trying to rotate the Google Maps API